Table 1.
Demographic characteristics of participants according to sex classification
| Total |
Sex |
p | |||
|---|---|---|---|---|---|
| n | % | men (n = 684) | women (n = 1,254) | ||
| Age, yearsa | 20.4±0.8 | 20.5±0.8 | 20.3±0.7 | <0.01 | |
| Ethnic Han, n | |||||
| Han | 1,753 | 90.5% | 608 (34.7%) | 1,144 (65.3%) | 0.113 |
| Others | 177 | 9.1% | 72 (40.7%) | 105 (59.3%) | |
| BMIa | 20.9±3.1 | 20.1±2.5 | 22.1±3.5 | <0.01 | |
| Normal | 1,672 | 86.3% | 18.1±0.9 | 17.9±0.97 | 0.259 |
| Overweight | 200 | 10.3% | 20.3±0.6 | 20.3±0.64 | 0.599 |
| Obesity | 64 | 3.3% | 24.8±2.9 | 23.5±2.2 | <0.001 |
| Body fat percentagea | 20.9 | 5.9% | 17.6±5.7 | 22.7±5.2 | <0.001 |
| Sleeping time | |||||
| <6 h | 103 | 5.3% | 32 (31.1%) | 71 (68.9%) | 0.631 |
| 6–8 h | 1,513 | 78.1% | 539 (36.3%) | 947 (63.7%) | |
| >8 h | 312 | 16.1% | 108 (7.9%) | 1,248 (92.1%) | |
a
Data are shown as mean ± SD.